Fire Protection Flashcards
What are overhead detection sensors
Continuous loop
Continuous loop systems
Semi conductor & pneumatic presssure
What are pneumatic pressure loops manufacturers called
Systron & donner
How does pneumatic pressure work
Pressure of gas increases as temperature increases and operates switch
Semi condcutor loop names
Kiddie , graviner , Edison , Fenwal
How does semi conductor work
Tube that contains semi conductor material which decreases electrical resistance as temperature increases, alarm triggered when resistance decreases below a certain point
What’s a local fire warning
Red warning light on the overhead panel
What are central warnings
Red master warning lights , aural warning and message on ECAM/EICAS
How is central warning canceled
Pressing master warning light
What is normal condition
Open contact High resistance
What is alarm condition
Closed contact low resistance
What systems are dual loop systems
Essential fire warning systems
How does dual system work
You need to 2 detections to ensure a fire is happening , single failure doesn’t present a fire warning
When do we do a fire test
Before we start apu or engine
What does the ceramic function as in a semiconductor loop
As an endless number of resistors
What’s the tempreture coefficient of the ceramic
Negative
What loop does semi conductor use
Closed loop
When can fire not be detected in a semi conductor loop
In an open loop
What does a short circuit trigger
Fire warning
When does a short circuit happen
Resistance decreases below the alarm threshold of 500 ohms
In a dual loop system what condition is needed to trigger fire warning
Alarm condition in both loops
Max bending
3.2mm
Minimum bend radius
25.4mm
What does the first pressure switch do
Monitor or integrity switch
